Crystal structure of tatrakis(1,10-phenanthroline)-fumarato-dilead(II) nitrate, [Pb2(C12H8N2)4(C4H2O4)](NO3)2

Abstract

Source of materialAm ixture of Pb(NO 3 ) 2 (0.5 mmol, 0.165 g), 1,10-phenanthroline (phen, 0.5 mmol, 0.100 g), fumaric acid (0.5 mmol, 0.058 .g) and H2O(18 mL) in a30mLTeflon-lined autoclave under autogenous pressure at 443 Kfor five days. After cooling to room temperature, brown block-shaped crystals were collected by filtration and washed with distilled water in 35 %yield (based on Pb). Elemental analysis -found: C, 45.4 %; H, 2.4 %; N, 10.0.%; calculated for C 52 H 34 N 10 O 10 Pb 2 :C,45.5 %; H, 2.5 %; N, 10.2 %. DiscussionThe past decade has witnessed an enormous expansion of the research field of coordination polymers based on metalorganic ligands. Coordination polymers with specific topologies display promising properties for potential technological and industrial application as catalysts, hosts in intercalation compounds, and electronic, electrooptical, photooptical, and magnetic materials [1][2][3][4]. Currently, rational design and synthesis of coordination polymers using rigid di-and polycarboxylates as bridging spacers are of growing interests [5,6]. On the other hand, exploitation of conventional saturated a,w-dicarboxylates as flexible bridging spacers to constitute coordination polymers aroused extensive attentions of many laboratories [7][8][9][10][11]. Among the saturated a,wdicarboxylate anions, the fumarate ligands are of special interest.To the best of our knowledge, the simultaneous coordination of fumarate groups to transition metal atoms tends to form coordination polymers with 2D open framework [12]. In the title crystal structure, the asymmetric unit contains one Pb(II) atom, two phen ligands, half fumarate ligand and one free nitrate. The Pb(II) atom is six-coordinated. Three nitrogen atoms from two phen ligands and two oxygen atoms from fumarate ligand form the equatorial plane